DE112009001751B4 - Device for injecting a liquid into a body, in particular the body of a patient - Google Patents

Abstract

Device (10) for injecting a liquid into a body, in particular the body of a patient, comprising: - a base (20) carrying an injection needle (22) intended to be inserted into the body; - an injection line (24) connected to the injection needle (22); - devices for removing (26) the injection needle (22) from the patient, which contain a pusher (52) which, with respect to the base (20), is between a position of use of the injection needle ( 22) and a removal position of the injection needle (22) is slidably mounted; - devices for generating (28) an overpressure in the injection line (24) when the injection needle (22) is removed, which has an elastic section (24) formed in the injection line (24). 53), a cam surface (54) connected to the pusher (52) and a support surface (55) connected to the base (20) in order to hold at least part of the elastic section (53) when the pusher (52) slides into the removal position compressing the injection needle (22) between the cam surface (54) and the support surface (55) radially and perpendicular to the injection needle (22); wherein the device has retaining means (56) of the compressible part of the elastic section (53) perpendicular to the injection needle (22), the retaining means (56) including a channel (70) for receiving the elastic section (53) which is in the base (20 ) is shaped, characterized in that the support surface (55) is a flank of the receiving channel (70), which is arranged parallel to the direction of displacement of the pusher (52).

Description

The invention relates to a device for injecting a liquid into a body, in particular the body of a patient according to the preamble of claim 1.

A device for injecting a liquid is known from US 2005/0 049 553 A1.

For certain medical conditions, it is necessary to inject a daily dose of liquid medication directly into a patient's organ. For this purpose, it is known that a chamber located under the skin is permanently implanted on the patient's chest. This chamber is extended by a catheter that runs in a vein or artery to the organ where the dose of medication is to be delivered. The implantable chamber includes a container having a perforable septum along its surface in contact with the skin.

To inject the drug dose, the needle of the device is inserted through the patient's skin into the implantable chamber, and the drug dose is injected through the needle into this chamber.

To carry out such injections, an injection device is usually used which has a carrier firmly connected to the needle. The support is extended by a tube, one end of which is connected to the injection needle and the other end is equipped with a connector that allows the connection of a syringe or container with a dose of medication to be injected.

To remove the needle from the implantable chamber, the physician grasps the device support and withdraws the needle from the patient.

The force used by the doctor to take out the needle is relatively large, so the risk of being pricked by a rebound phenomenon when the needle comes out of the skin is high. To avoid this danger, the injection device is usually provided with a withdrawal unit containing a needle protection structure that receives the needle when it is withdrawn in order to secure the needle and prevent the doctor from pricking himself.

When the needle is removed, it adheres to the septum, which rises, the internal volume of the chamber increases, creating strong suction. This suction is found at the end of the catheter, which is generally located in a blood vessel. Then blood enters the long hole of the catheter. As the needle then moves further out of the septum, the adhesive effect decreases, the septum then returns to its original shape and the internal volume of the chamber decreases without returning to its original size. There is therefore a remaining volume of blood at the end of the catheter.

This residual volume of blood can result in a deposition of fibrin (or other materials), which ultimately leads to a decrease in the throughput of the implantable chambers, which can even lead to clogging. So the chamber needs to be replaced frequently.

To remedy this problem, the FR 2 886 857 A1 a device of the type mentioned above is known, in which devices for generating an overpressure are provided in the removal unit in order to generate an overpressure in the injection line during removal.

However, with such a device, handling the needle when it is removed is not problem-free.

The aim of the invention is therefore to enable better handling of the needle during its removal.

For this purpose, the invention relates to an injection device according to claim 1.

• - der Querschnitt des elastischen Abschnitts und der Querschnitt der Injektionsleitung haben im Wesentlichen den gleichen Durchmesser;
• - die Nadel bildet einen Knick;
• - die Rückhalteeinrichtungen können den elastischen Abschnitt im Wesentlichen lotrecht zur Ebene der Nadel halten;
• - die Nockenfläche ist eine Langseite des Drückers, die bezüglich der Verschieberichtung des Drückers geneigt und zur Auflagefläche gerichtet ist;
• - der maximale Wert des Neigungswinkels zwischen der geneigten Langseite und einer Querebene des Drückers liegt zwischen 5° und 15°.
• - der Aufnahmekanal enthält eine Einführöffnung für den elastischen Abschnitt, die mit einer Außenseite des Sockels in Verbindung steht, wobei die Öffnung im Wesentlichen parallel zur Auflagefläche liegt;
• - der Drücker bildet eine Schutzkappe für die Nadel in der Entnahmestellung der Nadel;
• - der Sockel enthält einen Nadelträger und eine Muffe, wobei die Muffe bezüglich des Nadelträgers angelenkt ist und einen Gleitdurchgang des Drückers begrenzt.

According to other embodiments, the injection device contains one or more of the following features, individually or in all possible technical combinations:

• - the cross section of the elastic section and the cross section of the injection line have essentially the same diameter;
• - the needle forms a bend;
• - the retaining devices can hold the elastic section substantially perpendicular to the plane of the needle;
• - the cam surface is a long side of the pusher, which is inclined with respect to the direction of displacement of the pusher and directed towards the support surface;
• - The maximum value of the inclination angle between the inclined long side and a transverse plane of the pusher is between 5° and 15°.
• - the receiving channel contains an insertion opening for the elastic section which communicates with an outside of the base, the opening being substantially parallel to the support surface;
• - the pusher forms a protective cap for the needle in the needle removal position;
• - the base contains a needle carrier and a sleeve, the sleeve being articulated with respect to the needle carrier and limiting a sliding passage of the pusher.

• 1 eine perspektivische Ansicht einer Injektionsvorrichtung gemäß der Erfindung in einer Nutzungskonfiguration ist,
• 2 eine perspektivische Teilansicht der Vorrichtung ist, die bereit ist, um aus einer implantierbaren Kammer herausgezogen zu werden, wobei eine Nadel der Vorrichtung durch die Haut eines Patienten in die Kammer eingeführt ist,
• 3 eine Seitenansicht der Vorrichtung ist, die bereit ist, aus der Kammer herausgezogen zu werden, gemäß dem Pfeil III der 2,
• 4 eine perspektivische Ansicht der Vorrichtung in der entnommenen und gesicherten Stellung der Nadel ist, und
• 5 eine Schnittansicht der Vorrichtung gemäß der Ebene V der 4 ist.

The invention and its advantages will be better understood from the following description, which is given by way of example only and refers to the accompanying drawings, in which:

• 1 is a perspective view of an injection device according to the invention in a usage configuration,
• 2 is a partial perspective view of the device ready to be withdrawn from an implantable chamber with a needle of the device inserted through the skin of a patient into the chamber,
• 3 is a side view of the device ready to be withdrawn from the chamber, according to arrow III of 2 ,
• 4 is a perspective view of the device in the removed and secured position of the needle, and
• 5 a sectional view of the device according to plane V of 4 is.

In 2 an injection device 10 is connected to an implantable chamber 12 which is arranged under the skin 14 of a patient.

The chamber 12 has a substantially cylindrical container 16, which is delimited on its side in contact with the inner surface of the skin by a perforable membrane, not shown. The container 16 is connected to a tube 18 for transporting a medication solution to an organ, not shown.

In 1 The injection device 10 contains a base 20 which carries an injection needle 22 and an injection line 24 which is connected to the needle 22. The injection device 10 also has devices for removing 26 the needle from the patient and devices for generating 28 an overpressure in the injection line 24 when the needle is removed.

The base 20 has a needle carrier 30 and a sleeve 32 which is articulated with respect to the needle carrier 30.

The carrier 30 has an elongated and generally cylindrical central core 34 which is entirely formed by an in 5 Visible axial elongated hole 36 for transporting the liquid to the needle 22 is traversed. The needle 22 is firmly connected to an end of the core 34 which is referred to as downstream with respect to the transport direction of the liquid and which forms a head 38. On the side of the carrier facing the needle 22, the carrier 30 has a support plate 40 which extends along the length of the carrier with the exception of the end region forming the head 38, which projects with respect to the support plate 40.

The needle 22 has a curved free end in the form of a tip 42 intended to be implanted into the patient and opening laterally with respect to the general axis of the needle. It delimits a liquid injection passage inside.

The needle 22 forms a bend 44, in 5 visible, which is extended on the side of the tip 42 by a main section 46 with a vertical axis YY 'and on the side opposite the tip 42 by a vertical connecting section 48 which is inserted into the axial elongated hole 36 starting from the head 38. Near the front end of the core 34, the elongated hole 36 is extended by an extension 50, which ensures the connection of the channel 24.

The removal devices 26 of the needle from the patient include the base 20 and a pusher 52 which is slidably mounted with respect to the base 20. The pusher 52 can switch between a use position of the needle 22 or an inactive position of the removal devices 26, as determined by the 1 until 3 is illustrated, and a removal position of the needle 22 can be moved, as indicated by the 4 and 5 is illustrated.

The devices 28 for generating an overpressure in the injection line 24 when the needle 22 is removed contain an elastic section 53 formed in the injection line 24, a cam surface 54 firmly connected to the pusher 52 and a support surface 55 firmly connected to the base 20, around which to compress the elastic section 53 radially and perpendicular to the needle 22 between the cam surface 54 and the support surface 55 when the pusher 52 slides into the removal position of the needle 22.

The injection device 10 also has retaining devices 56 of the elastic section 53 essentially perpendicular to the needle 22. The retaining devices 56 can hold the elastic section 53 substantially perpendicular to the plane of the needle 22.

The sleeve 32 delimits a passage 57 for the movement of the pusher 52. The sleeve 32 is laterally along a surface line over a width open, which corresponds to the width of the central core 34 of the carrier.

On both sides of this opening, the sleeve 32 is extended by two flanks 58, which can slide around the central core 34. To connect the sleeve 32 to the central core 34, two circular holes are drilled into the flanks 58, in which lugs 59 are received, which consist of one piece with the central core 34 and extend along the joint axis X-X '. The hinge axis is arranged near the head 38, so that in the removal position of the needle 22 or the tilted position of the sleeve 32, the head 38 extends inside the passage 57.

At its end opposite the head 38, the sleeve 32 has two radial projections on the outside, which form a finger rest 60.

The sleeve 32 has on its flanks 58 protruding profiles 62A for elastic snapping into complementary hollow profiles 62B of the core 34 in order to ensure a temporary blocking of the removal devices 26 in a position of the sleeve 32 bent onto the support 30, as shown in 1 is illustrated.

The elastic section 53 extends between, upstream, a connection end 66 to a container, not shown, with a liquid to be injected and, downstream, the boss 50. The elastic tube 53 is provided with a clamp 68 between the container and the core 34, which can effectively close the injection line 24 in front of the device 10. The cross section of the elastic section 53 and the cross section of the injection line 24 have essentially the same diameter.

The retainers 56 have a channel 70 for receiving the elastic portion 53 formed in the sleeve 32, as shown in FIG 3 shown. The channel 70 extends substantially perpendicular to the needle 22 in the direction of the axis X-X'. The channel 70 has two elastic portion through openings 72 and an elastic portion insertion opening 74 located in 2 you can see. The through openings 72 have normals substantially in the direction of the axis X-X', and the insertion opening 74 is substantially perpendicular to the through openings 72. The openings 72, 74 communicate with corresponding outer sides of the sleeve 32.

The support surface 55 is a flank, visible in 3 , of the receiving channel 70, which is arranged essentially parallel to the direction of displacement of the pusher 52. The insertion opening 74 is essentially parallel to the flank 55.

The pusher 52 is formed by a rod 76 which is generally hollowed out and is open at a so-called front end facing the needle 22. The rod 76 delimits a cylindrical inner volume 77 for receiving the needle 22, which is closed at its rear end by a finger rest 78. The rod 76 forms a protective cap for the needle 22 in the removal position of the needle 22. The rod 76 is open from its front end via a slot 80 which extends over most of the length of the pusher. The width of the slot 80 is sufficient to accommodate the central core 34.

The cam surface 54 is a long side of the rod 76, which is inclined with respect to the direction of displacement of the pusher 52 and directed towards the support surface 55. The maximum value of the angle of inclination between the inclined long side 54 and a transverse plane of the pusher 52 is between 5° and 15° and is preferably equal to 10°. The angle of inclination between the inclined long side 54 and a transverse plane of the pusher 52 varies progressively from its maximum value to 0°. The inclined long side 54 is arranged on the side of the rod 76 that is opposite the slot 80. The rod 76 has a groove 84 at the front end of the inclined long side 54 for receiving the elastic section 53 in the inactive position of the removal devices 26. The throat 84 lies essentially in the direction of the channel 70 formed in the sleeve 32.

The rod 76 has, near the throat 84, an external annular groove 86 intended to receive elements 88 for elastic engagement made in one piece with the sleeve 32. The groove 86 and the elements 88 can ensure a temporary retention of the pusher 52 in the inactive position of the removal devices 26.

The operation of the injection device 10 according to the invention will now be described.

Initially, during product injection, the sampling devices 26 are in their inactive position and bent according to the length of the central core 34 of the needle carrier, as shown in FIG 1 shown. To inject the medication dose, the needle 22 is inserted through the patient's skin 14 into the chamber 16 until the plate 40 rests on the patient's skin 14.

The bent removal devices 26 then do not interfere with handling. Since the Dr cker 52 is also folded according to the central core 34, it does not protrude over its entire length with respect to the skin 14 of the patient, so that the injection device 10 can be easily held by an adhesive tape after insertion. The devices for generating 28 an overpressure are inactive.

To remove the injection device 10, the sleeve 32 and the pusher 52 are tilted about the axis XX 'to move into the 2 and 3 to be placed in an illustrated position. The doctor then inserts the elastic portion 53 through the insertion opening 74 into the channel 70 of the sleeve, as shown in 2 shown.

The pusher 52 is positioned along the Y-Y' axis of the main portion 46 of the needle and the two extensions 60 extend generally perpendicular to the Y-Y' axis. The wearer's head 38 is received in the hollowed pusher 52.

The doctor then closes the injection line 24 by operating the clamp 68 located upstream of the elastic portion 53. He then places two fingers on either side of the sleeve 32 under the finger rests 60 and presses the pusher 52 in with the help of another finger, for example his thumb, which presses on the finger rest 78.

The front end of the pusher 52 rests on the patient's skin 14 while the sleeve 32 is caused to rise according to the length of the pusher 52. The needle 22 is progressively received inside the pusher 52 until it is inserted into the 4 and 5 illustrated position is brought. In this position, the main portion 46 of the needle extends completely inside the internal volume 77 of the pusher and is protected, thereby avoiding any risk of accidental piercing.

During this displacement, the inclined long side 54 shifts in the direction of the elastic section 53 and perpendicular to it. The elastic section 53 is then progressively compressed between the inclined long side 54 and the flank 55.

In the in 5 In the removal position of the needle shown, the part of the elastic section 53 arranged in the channel 70 is completely clamped between the flank 55 and the inclined long side 54.

The displacement of the cam surface 54 therefore creates an excess pressure in the injection line 24, which causes liquid to flow from upstream to downstream. This flow prevents blood from entering the tube 18 connected to the chamber 16 when the needle 22 is removed.

The elastic section 53 is only arranged in the retaining devices 56 in the phase in which the needle 22 is removed from the patient, which significantly simplifies the handling of the device 10 when inserting the needle into the chamber 16. In addition, after insertion of the elastic portion into the retainers 56, the elastic portion 53 is removed from the finger rests 60 and the handling of the device 10 during removal of the needle 22 is then simplified.

Claims (9)

Device (10) for injecting a liquid into a body, in particular the body of a patient, comprising: - a base (20) carrying an injection needle (22) intended to be inserted into the body; - an injection line (24) connected to the injection needle (22); - Devices for removing (26) the injection needle (22) from the patient, which contain a pusher (52) which is slidably mounted with respect to the base (20) between a use position of the injection needle (22) and a removal position of the injection needle (22). ; - Devices for generating (28) an overpressure in the injection line (24) when the injection needle (22) is removed, which have an elastic section (53) formed in the injection line (24), a cam surface (54) connected to the pusher (52). ) and have a support surface (55) connected to the base (20) in order to hold at least part of the elastic section (53) between the cam surface (54) and the support surface when the pusher (52) slides into the removal position of the injection needle (22). (55) to compress radially and perpendicular to the injection needle (22); wherein the device has retaining means (56) of the compressible part of the elastic section (53) perpendicular to the injection needle (22), the retaining means (56) including a channel (70) for receiving the elastic section (53) which is in the base (20 ) is shaped, characterized in that the support surface (55) is a flank of the receiving channel (70), which is arranged parallel to the direction of displacement of the pusher (52). Device (10) after Claim 1 , characterized in that a cross section of the elastic section (53) and a cross section of the injection line (24) have the same diameter. Device (10) after Claim 1 or 2 , characterized in that the injection needle (22) forms a bend (44). Device (10) after Claim 3 , characterized in that the retaining devices (56) can hold the elastic section (53) perpendicular to a plane of the injection needle (22). Device (10) according to one of the preceding claims, characterized in that the cam surface (54) is a long side of the pusher (52), which is inclined with respect to the direction of displacement of the (52) and directed towards the support surface (55). Device (10) after Claim 5 , characterized in that a maximum value of the angle of inclination between the inclined long side (54) and a transverse plane of the pusher (52) is between 5° and 15°. Device (10) according to one of the preceding claims, characterized in that the receiving channel (70) contains an insertion opening (74) for the elastic section (53) which communicates with an outside of the base (20), the opening ( 74) lies parallel to the support surface (55). Device (10) according to one of the preceding claims, characterized in that the pusher (52) forms a protective cap for the injection needle (22) in the removal position of the injection needle (22). Device (10) according to one of the preceding claims, characterized in that the base (20) has a needle carrier (30) and a sleeve (32), the sleeve (32) being articulated with respect to the needle carrier (30) and a sliding passage ( 57) of the pusher (52).

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